https://mariadb.com/kb/en/getting-started-with-myrocks/
INSTALL SONAME 'ha_rocksdb';
CREATE TABLE sample (
id INT PRIMARY KEY AUTO_INCREMENT,
uid INT,
name VARCHAR(25),
ts TIMESTAMP,
KEY(`uid`) COMMENT 'cfname=cf_uid',
KEY(`name`) COMMENT 'cf_name'
) ENGINE=rocksdb;